Machine for making corrugated saw-toothed metal fasteners.



M. FISCHER. MACHINE FOR MAKING GORRUGATED SAW TooTHED METAL FASTBNERS. APPLIUATION FILED 1113.10, 1911.

1,006,838, Patented oct. 24, 191.

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COLUMBIA PLANMR'APH co.. WASHINGTON, D. c.

M. FISCHER. IIIIAGIIIIIEV FOR MAKING GORRUGATED SAW TOOTHED METAL FASTNERS.

APPLICATION FILED PEB. 10, 1911.

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UNTED STATES VPATENT FFFQE,

MAX FISCHER, OF NEW YORK, N. Y., ASSIGNOR TO ACME STEEL GOODS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

MACHINE FOR MAKING CORRUGATED SAW-TOOTI-IEI) METAL FASTENERS.

Specification of Letters Patent.

Patented Oct. 24, 1911.

Original application led June 23, 1910, Serial No. 568,662. Divided and this application filed February 10.

To all whom 'it may concern: Be it known that I, MAX FISCHER, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Machines for Making Corrugated Saw-Toothed Metal Fasteners, of which the following is a speciiication.

The invention relates to the production of metal fasteners which are corrugated and have a saw-toot-h formation along'the entering edge produced by beveling on opposite sides and consists in a machine for producing such fasteners in a practical and economical manner. Heretofore the product-ion of such fasteners by grinding the opposite faces of the entering edge at an angle has been proposed but it has been found in practice that fasteners produced in this way have webs filling or substantially filling the notches between the teeth whereby the desirability of such fasteners and their efficiency in use was greatly reduced. To obviate this objection I have invented a method of treating strips of metal for the formation of such fasteners which includes among its steps 4the removal of the web from between the teeth or serrations and this method forms the subjectmatter of` an application, Serial No. 568,602, led J une 23, 1910, of which the present application is a division.

In the drawings which form a part of this application and illustrate a preferred form of my invention and a modification of one Y of the elements, Figure l represents in plan view a series of instrumentalities for producing the article from a plain strip of metal; Fig. 2 is a cross-section on the line 2-2 of Fig. l; Figs. 3 and 4 are diagram- 'matic views illustrating the effects produced by certain of said instrumentalities; Fig. 5 is a sectional view illustrating the construction of one of the web upsetting wheels and its effect upon the corrugated and beveled strip; 6 is a section on the'line 6-6 of Fig. 5; Fig. `7 is a view similar to Fig. 5 but illustrating the modification above alluded to; and Figs. 8, 9 and 10 illustrate the metal strip at different stages.

Referring firstV to'Fig, l, reference nuandone in advance of the other.

Serial No. 607,751.

meral 2 designates a pair of horizontally disposed corrugating rolls driven from a line shaft 3 through beveled gearing 4l and operatively connected together by spur gears 5, Fig. 2. The plain metal strip a is entered between the corrugating rolls 2 and acted upon thereby to convert the strip into corrugated form and also advance it. At a point above the bed plate 6 in advance of the corrugating rolls 2 there is suitably mounted an emery wheel 8 set to grind away the upper ends of the corrugations at one side of the strip thereby beveling the latter, and a short distance beyond this emery wheel there is mounted a similar wheel 9 to act correspondingly upon the opposite side of the strip. These emery wheels are preferably journaled in heads 10 adjustably mounted upon the bed plate 6, and they may be driven from any suitable source of power through any appropriate connections. The spindles are here illustrated as carrying drive pulleys 11. Vhen the strip a emerges from the oorrugating rolls 2 it appears in side view as illustrated by the right-hand portion of Fig. 8, and when it has passed the emery wheels S and 9 it will appear as in Fig. 9, the corrugations having been ground away, beveling the strip on opposite sides along the top edge and outlining notches in the corrugations, which notches, however, will be filled, or substantially filled by thin webs o. Obviously the strip in this form is unsuitable for use as a saw-tooth metal fastener since no well defined saw-teeth have been produced and the webs Z) will prevent the desired action when the fastener is driven into wood, to-wit, that of first penetrating the wood by reason of the presence of a series of points and then cutting through by reason of the action of inclined edges back of the points. Before the strip can be utilized for being cut up into fasteners the notches in the beveled ends of the corrugations must be cleared out.

Referring to Fig. 1, there are loosely journaled on posts l2 rising from the bed plate 6 a pair of wheels for upsetting the web o, these wheels being located on opposite sides of the line' of travel of the strip Each wheel has the same construction, which is best illustrated in Fig. 5. It comprises a lower disk 13 corrugated to register with the corrugations of the strip a, and an upper thicker disk let rigidly secured to the disk 13 and beveled at its periphery and having a. circumferential series of V-shaped teeth or serrations 15. The wheel is so constructed that, set horizontally with the corrugated disk 13 adapted to register with the corrugations of the metal strip a, the serrations or V-shaped teeth 15 will successively enter the notches of the strip and take effect to upset the web Z), the acting serration or tooth disposing itself obliquely andl penetrating to the base of the notch so that the web will be completely upset as illustrated in Figs. 5 and 6, burs c being struck up. The serrations 15 of one of the wheels successivelv engage in the corrugations along one side of the strip a, and the serrations of the other wheel similarly engage the strip on the opposite side, so that when the strip has passed both of these specially constructed Wheels it will have burs c projecting on opposite sides. It only remains then to remove these burs, and inasmuch as the web produced in the grinding is necessarily attenuated more or less, and further weakened in the upsetting produced by the serrated wheels, these burs are of a character to present almost negligible resistance to removal. Therefore their removal may be readily accomplished in various ways. However', in order to insure the desirable smoothness and finish along the sides of the beveled edge of the strip and in the notches thereof, I prefer to employ a second pair of emery wheels similarly related to the strip as are the` before described wheels 8 and 9.

' These finishing emery wheels are designated by the numeral 16 and may be driven in any suitable manner. Their spindles are here shown as equipped with pulleys 17 and the wheels are shown journaled in adjustable heads or holders 18. Beyond these finishing emery wheels there are mounted above the bed plate 6 a pair of corrugated rolls or wheels 2O similar to the before described rolls 2, though not performing any corrugating but merely serving as feed rolls. They are driven the same as are the corrugating rolls 2, from the line shaft 3 through bevel gearing 21 and connected spur gears similar to those designated 5 in Fig. 2. These feed rolls 20 of course keep step with the corrugating rolls 2 and these two sets of corrugated rolls obviously serve to steadily and continuously advance the strip, subjecting it' to the action of the intermediate instrumentalities comprising the two sets of emery wheels and the web upsetting wheels. The-advance of the strip to the second set lof emery wheels and the striking of the 'burs c against the latter will go far toward this mere contact.

removing the burs and in practice the burs will be to a very great extent removed by However, as the strip advances there is a grinding action of the emery wheels 16 which effects a desirable finishing operation, the burs being more cleanly eliminated and the draw cutting edges in the notches of the strip being therefore left in better shape, z'. e. without irregularities.

In order to feed a strip in a direct path between the grinding and other operating wheels and to hold the strip against the various instrumentalities for their action upon it, I provide a pair of guides 22, see Figs. 2 and 5, which are spaced apart a. sufliclent distance to permit the passage of the strip without undue friction and yet to support it in an upright position notwithstandingI the pressure exerted upon it by the grinding of the wheels.

In Fig. 10 a section of a strip is represented, the left-hand portion of which appears substantially as it would just after passing the web upsetting wheels, whereas the right-hand portion represents the appearance of the strip after passing the finishing grinders 16.

Fig. 7 illustrates a modification in the form and arrangement of the web-upsetting wheel. Here it is illustrated as a single disk 14a set obliquely, with its V-shaped teeth or serrations 15a extending at right angles to its opposite faces. Thus the effective engagement of serrations in the notches of the corrugated and beveled strip a is obtained by reason of the oblique setting of the wheel instead of, as in the con-l struction first described, by a bevel of the periphery. It will be understood that in either case the web-upsetting wheels rotate freely, deriving motion from the strip itself. The construction illustrated in Fig. 5 has the advantage over that illustrated in Fig. 7 of more certainly insuring exact seating of serrations in the notches of the strip for the reason that the corrugated disk 13 controls the relationship between wheel and strip by registering with the corrugations of the latter.

It will be obvious that the single-piece web-upsetting wheel might be employed after the manner of the wheel shown in Fig. 5, but having a beveled periphery, or, in

other words, that the upper section of the essential to a carrying out of the invention, so long as the construct-ion and arrangement be such as to so dispose the teeth or serrations that they will successively seat themselves in the notches and fully upset the Web.

What is claimed is:

l. In a machine for forming metal fasteners from corrugated strips of metal, the combination With bevel-grinding means; of serrated Wheels adapted to upset Webs in the notches formed by grinding, and means for removing the burs formed by the upsetting of the Webs.

2. The combination with corrugating and bevel-grinding means; of serrated Wheels adapted to upset Webs in the notches formed by grinding; and means for removing the burs formed by the upsetting of the Webs.

8. In a machine for producing metal fasteners from a strip of corrugated metal, the combination with beveled grinding means, of Wheels comprising corrugated portions to register with the corrugations of the strip and serrated portions to upset the Web formed in the notches of the strip, and means for removing the burs formed by the upsetting of the Web.

4:. In a machine for producing metal fasteners from strips of corrugated metal, a frame, a Wheel mounted therein comprising corrugated portions to register With the corrugations of the strip and serrated portions to upset the Web formed in the notches of the strip and means for feeding a corrugated metal strip to the Wheel.

5. The combination With corrugating and bevel-grinding means; of Wheels comprising corrugated portions to register With the corrugations of the strip and serrated portions to upset the Web formed in the notches of the strip; and means for removing the burs formed by the upsetting of the Web.

6. The combination of corrugating and feeding rolls; grinding Wheels set to operate on opposite sides of the corrugated strip to bevel the same; serrated Wheels set to enter the notches of the beveled strip and upset the Web produced by grinding; grinding Wheels set to remove the burs formed by said serrated Wheels; and feed rolls beyond the last-mentioned grinding Wheels.

7 Means for upsetting the web formed by bevel grinding a strip of corrugated metal consisting in a Wheel With a serrated periphery and means for feeding a strip to said Wheel with the plane of the strip at an angle to the periphery of the Wheel.

8. A Web-upsetting Wheel for metal fastener making machine, consisting of a corrugated cylindrical disk and a beveled serrated disk.

MAX FISCHER.

Witnesses:

H. COWLES SMITH, WM. F. KAMMERER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

